Thanks for the tip, this may seems a daft question, but a skinny frog, it's hard to say as he's not that big anyway. If he is skinny, then what should I do. They recommended at the petshop to remove him from his tank into a smaller one, load it with food and then see if he eats then. My only problem with this is that they are sensitive to change and I don't want to freak it out and make it worse.